CN210277316U - Extrusion nail with self-locking function and assembly tool of extrusion nail - Google Patents

Abstract

The utility model provides a take self-locking function's extrusion nail and assembly utensil of extrusion nail, it includes: and a nail body having an elongated shape, the nail body having a main body and at least two protrusions protruding from the main body in a radial direction, the protrusions extending in a longitudinal direction of the nail body, wherein, in a cross section of the nail body taken in the radial direction, one end side of the protrusions is formed in the nail body in such a manner that the other end side extends to an opposite side with respect to a rotational direction of the nail body, and a thread is formed in an outward-facing portion of the protrusions. Under this condition, the nail body can prevent to take place the phenomenon of smooth silk and restrict the rotatory direction of nail body at the in-process that the nail body was twisted into through the jut, and the jut can form the back-off in the bone way simultaneously, and the nail body can realize self-locking structure through the back-off, avoids the bone nail to take place not hard up the condition appearance of withdrawing from, in addition, can reduce and extrude the nail and take place not hard up the possibility.

Description

Extrusion nail with self-locking function and assembly tool of extrusion nail

Technical Field

The disclosure relates to an extrusion nail with a self-locking function and an assembling tool of the extrusion nail.

Background

Cruciate ligament injury is one of the common sports injuries in daily life. The tearing of the cruciate ligaments can directly affect the motor ability of a patient, and improper treatment can cause instability of the knee joint and secondary articular cartilage damage, and finally affect the function of the knee joint. At present, the reconstruction of the cruciate ligament by using a compression nail under an arthroscope is one of the main treatment means of the cruciate ligament injury. Fix the tendon in the bone tunnel through the extrusion nail, guarantee the healing of tendon, can also prevent that the tendon from removing in the bone tunnel and causing the tunnel to enlarge.

The earliest clinically used non-absorbable metal extruded nails. The metal extrusion nail has the advantages of high material strength and firm fixation. However, since the metal extrusion nail is not absorbed by human body, if it stays in human body permanently, it will bring some harm to human health. For example, the bone around the extrusion nail is dissolved or the extrusion nail is exposed, so that articular cartilage is damaged, synovitis is formed, and the like, and some metal extrusion nails can be influenced in nuclear magnetic resonance examination, so that a patient cannot carry out the nuclear magnetic resonance examination; if the patient is taken out by operation, secondary damage is caused to the patient, and more complications can be caused.

Extruded nails made of absorbable materials have been developed for this purpose. After years of improvement, the strength of the extrusion nail is enough for use, and the absorbable characteristic after implantation greatly reduces the trouble of patients. However, in clinical operation, the improved absorbable material has lower strength compared with metal, and is easy to cause slippery condition in use. Once the slippery thread appears, the doctor can hardly take out the ineffective extrusion nail, which brings inconvenience to the doctor.

In addition, because the extrusion nail made of the absorbable material is not uniformly degraded when degraded in a bone tunnel, the growth of bone tissues is not uniform, even the fixation strength of the extrusion nail is insufficient, and the loosening and displacement are caused, thereby bringing great hidden trouble and inconvenience to patients.

Disclosure of Invention

The present disclosure has been made in view of the above-mentioned prior art, and an object of the present disclosure is to provide a compression screw with a self-locking function and an assembling tool for the compression screw, which can prevent the occurrence of thread slipping during the screwing process of a bone screw and prevent the bone screw from loosening and withdrawing.

Therefore, the present disclosure provides a take self-locking function's extrusion nail, it includes: a nail body having an elongated shape, the nail body having a main body and at least two protrusions protruding from the main body in a radial direction, the protrusions extending along a longitudinal direction of the nail body, wherein, in a cross section of the nail body taken along the radial direction, one end side of the protrusions is formed on the nail body in such a manner that the other end side extends to an opposite side with respect to a rotational direction of the nail body, and a thread is formed at a portion of the protrusions facing outward.

In this case, the nail body can prevent the phenomenon of slipping in the process that the nail body is screwed in and restrict the direction of the rotation of the nail body through the protruding part, and simultaneously the protruding part can form the back-off in the bone way, and the nail body can realize the self-locking structure through the back-off, avoids the condition that the bone nail takes place to become flexible and withdraws from appearing, and in addition, the part of the protruding part towards the outside is formed with the screw thread so that the nail body can closely form the interlock with the bone way through the screw thread of the outside, therefore, can reduce the possibility that the extrusion nail takes place the circumstances such as slipping, becoming flexible, withdraws from.

In addition, in the extrusion nail related to this disclosure, optionally, still include the pin head that is connected with the nail body, the pin head is the form of tapering. Thereby, the driving of the pressing nail into the bone tissue can be facilitated.

In addition, in the extrusion nail according to the present disclosure, optionally, the nail body is made of one material selected from medical stainless steel, platinum, titanium alloy, titanium-nickel memory alloy, cobalt-chromium alloy, and magnesium alloy. In this case, by manufacturing the extrusion nail using the above material, the material strength of the extrusion nail can be made high, the fixation is secured, and the possibility of occurrence of the slip and the possibility of displacement in the bone tunnel are reduced.

In addition, in the extrusion nail according to the present disclosure, optionally, the material of the nail body is selected from one of a polylactic acid material, polycaprolactone, polydioxanone, polyetheretherketone or polyglycolic acid, or one of a random copolymer or a block copolymer of more than two elements selected from lactide, caprolactone, polydioxanone or glycolide. In this case, by using the absorbable material to manufacture the extrusion nail, not only the occurrence of the secondary operation but also the occurrence of various inconveniences such as the inability to perform nuclear magnetic resonance examination or the occurrence of inflammation such as synovitis, which may be caused by remaining in the body, are prevented.

Additionally, in the extruded nail of the present disclosure, optionally, the nail body has a distal end and a proximal end, and the thread has a smaller pitch at the proximal end than at the distal end. Therefore, the injury of the screw to the ligament can be reduced, and the fixation of the compression nail in the bone tunnel can be facilitated.

In addition, in the extrusion nail according to the present disclosure, each of the protrusions may be uniformly distributed on the outer periphery of the nail body. Thereby, the nail body can be rotated by the projection.

In addition, in the extrusion nail according to the present disclosure, optionally, the extrusion nail further has a through hole penetrating the nail body along the length direction. In this case, positioning can be performed through the through hole and bone fragments can be easily discharged from the through hole when the jig is used, and the squeeze nail can be easily taken out by injecting lubricating liquid through the through hole when the squeeze nail is taken out.

In addition, in the extrusion nail according to the present disclosure, optionally, an angle between the protrusion and the main body is an acute angle in a cross section of the nail body taken along the radial direction. Therefore, the reverse buckle can be formed on the periphery of the nail body, and the extruded nail is prevented from slipping.

Further, in the extrusion nail according to the present disclosure, optionally, a cross section of the nail body taken along the radial direction has rotational symmetry. Therefore, the balance of the extrusion nail body can be ensured, and the stress can be uniformly dispersed.

Furthermore, another aspect of the present invention provides an assembly tool for a pressed nail, characterized by being used for operating the pressed nail according to any one of the above. Therefore, the implantation of the extrusion nail can be facilitated.

According to the invention, the extrusion nail with the self-locking function and the assembling tool of the extrusion nail can be provided, which can avoid the occurrence of thread slipping in the process of screwing in the bone nail and prevent the bone nail from loosening and withdrawing.

Drawings

Fig. 1 is a schematic view showing the use of a ligament-fixing squeeze pin according to an embodiment of the present invention.

Fig. 2 is a perspective view showing an angle of a ligament-fixing squeeze pin according to an embodiment of the present invention.

Fig. 3 is a perspective view showing another angle of the ligament-fixing squeeze pin according to the embodiment of the present invention.

Fig. 4 is a plan view showing a ligament-fixing squeeze pin according to an embodiment of the present invention.

Fig. 5 is a perspective sectional view showing a ligament-fixing squeeze pin according to an embodiment of the present invention.

Fig. 6 is a plan sectional view showing a ligament-fixing squeeze pin according to an embodiment of the present invention.

Fig. 7 is a partial schematic view illustrating an S region of the extrusion nail shown in fig. 6.

Fig. 8 is a plan view showing an extrusion nail according to an embodiment of the present invention.

Fig. 9 is a perspective view showing a press nail attachment according to an embodiment of the present invention.

Fig. 10 is a bottom view showing the press pin attachment according to the embodiment of the present invention.

Fig. 11 is a perspective view illustrating the cooperation of the pressing nail and the assembling tool according to the embodiment of the present invention.

Reference numerals:

1 … extrusion nail, 10 … nail body, 11 … protrusion part, 12 … through hole, 13 … main body, 2 … assembling tool, 21 … holding part and 22 … support leg.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. In the drawings, the same components or components having the same functions are denoted by the same reference numerals, and redundant description thereof will be omitted.

Cruciate ligament injury is one of the common sports injuries in daily life. For example, the cruciate ligament of knee joint, also known as cruciate ligament, is located between the medial and lateral condyles of femur, with the anterior and posterior two intersecting each other. The anterior cruciate ligament prevents the tibia from moving forwards, is used for connecting the femur and the tibia and is an important structure for maintaining the stability of the knee joint; the posterior cruciate ligament prevents the tibia from shifting posteriorly. The tearing of the cruciate ligaments can directly affect the motor ability of a patient, and improper treatment can cause instability of the knee joint and secondary articular cartilage damage, and finally affect the function of the knee joint.

Fig. 1 is a schematic view showing the use of a ligament-fixing squeeze pin 1 according to an embodiment of the present invention. In the application scenario of the compression pin 1, the compression pin 1 functions as a means for fixing the ligaments of the knee joint for reconstruction of the cruciate ligaments of the knee joint.

In the present embodiment, as shown in fig. 1, when the ligament-fixing compression pin 1 according to the present embodiment is used, the entire compression pin 1 is inserted into a bone tunnel, and the ligament in the bone tunnel is compressed, whereby the ligament is fixed and repaired. The compression nail 1 provided by the invention effectively implants ligaments such as tendons into a bone tunnel, and ensures the healing of the tendons. In addition, by pressing the nail 1, it is possible to prevent the tendon from moving in the bone tunnel and enlarging the tunnel.

The extruded nail 1 according to the present embodiment may be referred to as an interface screw, a bone screw, or an interface extruded nail 1 in the field of orthopedic implantation.

Fig. 2 is a perspective view showing an angle of the ligament-fixing squeeze pin 1 according to the embodiment of the present invention. Fig. 3 is a perspective view showing another angle of the ligament-fixing squeeze pin 1 according to the embodiment of the present invention. Fig. 4 is a plan view showing a ligament fastening compression pin 1 according to an embodiment of the present invention. Fig. 5 is a perspective sectional view showing the ligament fastening clip 1 according to the embodiment of the present invention. Fig. 6 is a plan sectional view showing a ligament fastening compression pin 1 according to an embodiment of the present invention. Fig. 7 is a partial schematic view illustrating an S region of the compression nail 1 shown in fig. 6. Fig. 8 is a plan view showing the extruded nail 1 according to the embodiment of the present invention.

The utility model provides a take self-locking function's extrusion nail 1, it includes: the nail body 10 is long, the nail body 10 has a main body 13 and a protrusion 11 protruding from the main body 13 along a radial direction, the protrusion 11 extends along a longitudinal direction of the nail body 10, wherein, on a cross section of the nail body 10 taken along the radial direction, one end side of the protrusion 11 is formed on the nail body 10 in a manner that the other end side extends to an opposite side with respect to a rotation direction of the nail body 10, and a thread is formed on an outward facing portion of the protrusion 11.

In this case, the nail body 10 can prevent the occurrence of the phenomenon of slipping during the screwing process of the nail body 10 and limit the rotation direction of the nail body 10 through the protrusion 11, meanwhile, the protrusion 11 can form an inverse buckle in the bone path, the nail body 10 can realize a self-locking structure through the inverse buckle, the occurrence of the situation that the bone nail is loosened and withdrawn is avoided, in addition, the part of the protrusion 11 facing to the outer side is formed with a thread, so that the nail body 10 can be tightly meshed with the bone path through the thread on the outer side, and therefore, the possibility that the situation that the slipping, the loosening, the withdrawing and the like occur in the compression nail 1 can be reduced.

In some examples, the shank 10 may be cylindrical. The nail body 10 may have a cylindrical shape, a tapered shape, a truncated cone shape, an irregular shape, or the like. Thus, the nail body 10 can be in different shapes according to different application scenes.

In addition, in some examples, the extruded nail 1 may further include a nail head connected to the nail body 10. For convenience of explanation, the extruded nail 1 is roughly divided into a shank 10a (shank 10) and a head 10b at this time (see fig. 6 described later). Here, the boundary between the shank 10a and the head 10b is not absolute, and is illustrated only schematically in fig. 6.

In some examples, the head may be tapered and the larger diameter side of the head is connected to the shank 10. Thereby, the entry of the compression nail 1 into the bone tunnel can be facilitated.

In other examples, the head and body 10 may be integrally formed. In this case, the head and the shank 10 are formed integrally, whereby the head and the shank 10 can be prevented from being separated from each other during the operation of pressing the nail 1, thereby preventing the possibility of the pressed nail 1 slipping out due to the separation.

In addition, in some examples, the material of the extrusion nail 1 may be selected from one or more of polylactic acid material, polycaprolactone, polydioxanone, polyetheretherketone, and polyglycolic acid. In addition, in some examples, the material of the extruded nail 1 may also be selected from one or more of lactide, caprolactone, more than two random copolymers or block copolymers of p-dioxanone and glycolide. Further, in other examples, the extruded nail 1 may be further composed of one or more of Polyorthoesters (POE), polyamphosphine, polycaprolactone, polyester urethane, polyanhydride-imine copolymer, polyhydroxybutyrate and its copolymer, and polyamino acids (PAA).

In the present embodiment, by using the extruded nail 1 made of the above-described material, not only the secondary removal operation can be avoided, but also various inconveniences caused by leaving the metal extruded nail 1 in the body, such as failure of nuclear magnetic resonance examination, or inflammation such as synovitis, etc., can be avoided. In addition, the compression nail 1 made of absorbable material such as polylactic acid (PLA) has an effect of promoting bone tissue healing.

In the present embodiment, the extrusion nail 1 may also be composed of one or more of medical stainless steel, platinum, titanium alloy, titanium-nickel memory alloy, cobalt-chromium alloy, or magnesium alloy. In this case, the pressing nail 1 can also effectively function to fix the ligament. Since the above material is relatively low in price and high in material strength, fixation is firm, and it is more excellent in terms of reducing the possibility of occurrence of sliding and displacement in a bone tunnel, compared with an absorbable material.

In the present embodiment, the thread provided at the outward portion of the protrusion 11 may be a thread of a thread type. This increases the frictional force between the compression nail 1 and the bone tunnel.

In the present embodiment, the portion of the protrusion 11 facing outward may be provided as an UNR thread. The UNR thread is also a uniform thread with constant pitch at the root of the circular arc.

In some examples, the threads may also be provided as a round root coarse series unified thread (UNRC), a round root fine series unified thread (UNRF), a round root ultra fine series unified thread (UNREF), or a round root special series unified thread (UNRS).

In other examples, the thread may also be a standard coarse huh series, a standard english standard BS84 english thread with 55 angles (b.s.w.), a standard fine huh series, a general cylindrical thread (b.s.f.), an additional selectable huh series, a general cylindrical thread (whit.s), a non-standard thread of huh (Whit), a uniform thread of constant pitch (UN), a uniform thread of coarse (UNC), a uniform thread of fine (UNF), a uniform thread of ultra fine (UNEF), or a uniform thread of special series (UNs ①).

In addition, as shown in fig. 8, in the present embodiment, the nail body 10 may further have a distal end close to the ligament and a proximal end far from the ligament in the length direction. Here, for convenience of explanation, both ends of the nail body 10 are divided into a distal end contacting the tissue or ligament first and a proximal end opposite to the distal end in the order in which the nail body 10 enters the bone tunnel.

In the present embodiment, the thread provided in the outward portion of the protrusion 11 has a distal thread pitch H1 larger than a proximal thread pitch H2, that is, the distal thread is looser than the proximal thread. In this case, the distal thread is relatively sparse (i.e., the pitch is relatively large) compared to the proximal thread, so that when the nail body 10 is implanted into a bone tunnel, the distal portion of the nail body 10 can reduce damage to ligaments in the bone tunnel, and the proximal portion of the nail body 10 can increase the friction between the compression nail 1 and the bone tunnel, thereby facilitating the compression nail 1 to enter the bone tunnel and be fixed therein.

In addition, as shown in fig. 6 and 7, in the present embodiment, the crest of the thread provided at the portion of the protrusion 11 facing the outside may have a chamfer. In the present embodiment, θ may be equal to the sum of flank angles on both sides of the crest, for example, 30 to 60 °. This reduces the possibility of secondary damage to the bone tunnel and ligaments by the compression pin 1.

In other examples, the chamfer of the crest of the thread provided to the outward-facing portion of the protrusion 11 may be flat-top or dome-shaped. Therefore, the sharpness of the thread of the extrusion nail 1 can be reduced, and the cutting damage of the extrusion nail 1 to the ligament can be avoided.

In the present disclosure, the protrusion 11 extends along the longitudinal direction of the nail body 10, and one end side of the protrusion 11 is formed on the nail body 10 such that the other end side extends to the opposite side with respect to the rotational direction of the nail body 10 in a cross section of the nail body 10 taken along the radial direction. In this case, the direction in which the shank 10 can be rotated is limited by the presence of the portion extending to the opposite side, and the shank can be rotated only in one direction, whereby the compression nail 1 can have an effect of automatic locking after entering the bone tunnel.

In the present disclosure, the length of the one end side of the protrusion 11 extending from the other end side to the opposite side with respect to the rotational direction of the nail body 10 may be adaptively adjusted according to the circumferential length of the cross section. This can maintain the portion of the protrusion 11 extending at an appropriate ratio.

In the present disclosure, the pressing nail 1 may be rotated in the counterclockwise direction D as viewed in a section of the nail body 10 taken in the radial direction. In other examples, the compression nail 1 may be rotated in a clockwise direction as viewed in a cross section of the nail body 10 taken in a radial direction.

In addition, as described above, the protrusion 11 may penetrate the nail body 10 along the longitudinal direction of the nail body 10, that is, the length of the protrusion 11 may be substantially equal to the length of the nail body 10. In this case, during the implantation of the extrusion nail 1 into, for example, a bone tunnel of bone tissue, the generated bone fragments or bone fragments can be easily discharged along the gap between the protrusion 11 and the main body 13.

In some examples, the length of the protrusion 11 may be slightly less than the length of the nail body 10. In some examples, the tack body 10 may also have a distal end proximal to the ligament and a proximal end distal to the ligament along the length. In this case, by increasing the height of the proximal protrusion 11, the proximal end is more easily adapted to the mounting tool 2.

In addition, in some examples, a cross section of the nail body 10 taken along the radial direction may have rotational symmetry. This ensures the balance of the body 10 of the staple 1, and allows uniform stress distribution.

In some examples, the outer circumference of the shank 10 has at least two protrusions 11, each of which is evenly distributed over the outer circumference of the shank. This enables the nail body 10 to be rotated by the projection 11.

In the present disclosure, the protrusions 11 (in the present embodiment, the protrusions 11a, 11b, and 11c) may be distributed at equal angles therebetween, for example, in the case where three grooves are provided, the protrusions 11a, 11b, and 11c may be distributed at equal angles. That is, the protrusions 11a, 11b, and 11c may be uniformly distributed along the outer circumference of the nail body 10. In this case, the force of the pressing nail 1 is uniformly applied, and the possibility of occurrence of thread slipping is further reduced.

In other examples, the protrusions 11 may be distributed at different angles, for example, when three protrusions 11 are provided, the protrusions 11a, 11b, and 11c may be distributed at different angles. In this case, the protrusions 11 disposed at different angles can guide the bone tissue to grow along the angle between the protrusions 11 and the main body 13, which is more suitable for the case of special requirements for bone tissue growth.

As described above, the two or more protrusions 11 are provided on the periphery of the extrusion nail 1, so that the doctor can use the protrusions 11 to increase the torque when twisting the extrusion nail 1 using the assembling tool 2, and thus the extrusion nail 1 can be twisted with a small force, thereby avoiding the possibility of occurrence of the wire slipping phenomenon due to the excessive local stress, and in addition, the operation efficiency of the operator such as the doctor can be further improved.

As shown in fig. 4, in some examples, the protrusion 11 and the body 13 form an acute angle α in a cross section of the nail body 10 taken along the radial direction, thereby forming an undercut on the outer circumference of the nail body 10 and preventing the pressed nail 1 from slipping out, in other examples, the protrusion 11 and the body 13 may be formed with a chamfer or a fillet, thereby enabling the attachment tool 2 to be easily engaged with the pressed nail 1.

In some examples, the acute angle α formed by protrusion 11 and body 13

In the present disclosure, fig. 4 shows the approximate position of the main body 13, and here, the boundary between the main body 13 and the protrusion 11 is not absolute, but only for the purpose of schematic explanation in fig. 4.

In addition, in the present embodiment, since the protrusion 11 can penetrate the nail body 10 along the longitudinal direction of the nail body 10, the bone tissue grows in the gap between the protrusion 11 and the main body 13 during the growth, which is not only advantageous for promoting the repair of the damaged portion by finding the point of application of force to the bone tissue, but also advantageous for reducing the possibility of displacement of the compression nail 1 by forming an engagement structure with the compression nail 1. In addition, the discharge of bone chips or bone dregs is facilitated.

In addition, in the press stud 1 according to the present disclosure, optionally, the press stud 1 further has a through hole penetrating the stud body 10 in the longitudinal direction. In this case, positioning can be performed through the through hole and bone fragments can be easily discharged from the through hole when the attachment 2 is used, and the extrusion nail 1 can be easily removed by easily injecting lubricating liquid through the through hole when the extrusion nail 1 is removed.

In some examples, the through-hole 12 may be a cylindrical through-hole. In other examples, the through-holes 12 may also be triangular, square, irregular, etc. In this case, the range of force applied to the compression nail 1 can be increased by the through-hole 12 when the fitting tool 2 is used, so that the force can be stably applied, bone fragments can be discharged through the through-hole 12, and a positioning function can be performed when the fitting tool 2 is used.

In addition, in some examples, the through hole 12 may further have a communication hole (not shown) communicating with the outer circumference of the nail body 10. This also makes it possible to inject a lubricating fluid into the outer periphery of the nail body 10 through the through-hole 12 when the compression nail 1 is removed, thereby reducing the frictional force between the compression nail 1 and the bone tunnel and facilitating the removal of the compression nail 1. In some examples, a plurality of communication holes (not shown) may be provided to communicate with the outer circumference of the nail body 10 therethrough.

Fig. 9 is a perspective view showing the fitting tool 2 of the extruded nail 1 according to the embodiment of the present invention. Fig. 10 is a bottom view showing the fitting tool 2 of the press nail 1 according to the embodiment of the present invention. Fig. 11 is a schematic perspective view showing the fitting of the extrusion pin 1 and the fitting tool 2 according to the embodiment of the present invention.

Furthermore, another aspect of the present invention provides an assembling tool 2 for a press stud 1, characterized by being used for operating the press stud 1 of any one of the above. Thus, implantation of the extrusion nail 1 can be facilitated.

Hereinafter, the assembling tool 22 for operating the compression pin 1 for fixing the ligament will be described in detail with reference to fig. 9 to 11.

The mounting tool 2 according to the present embodiment includes: a grip portion 21; two or more legs 22 provided to the grip portion 21 so as to extend from the grip portion 21, the legs 22 being insertable into a gap between the protrusion 11 and the body 13 of the extrusion pin 1; and positioning posts (not shown) provided between the legs 22 and fitted into the through holes 12 of the press nails 1. In this case, the assembling tool 2 can embed each part into the corresponding part of the extrusion nail 1 when in use, so as to play the roles of stably bearing force and preventing wire sliding.

When implanting the extrusion nail 1 into, for example, a bone tunnel, the mounting tool 2 and the extrusion nail 1 may be first assembled together, at which time the legs 22 and the positioning posts of the mounting tool 2 are inserted into the gaps between the protrusions 11 and the main body 13 of the extrusion nail 1 and the through holes 12 at corresponding positions (see fig. 11). Next, the fitting tool 2 (specifically, the grip portion 21 of the fitting tool 2) is operated to insert the extrusion pin 1 into a certain position (bone tunnel). The crimp pin 1 can then be pushed into place to a suitable depth by operating (e.g. rotating clockwise) the fitting 2, so that the crimp pin 1 is fixed, for example together with a ligament, in a bone tunnel. Finally, the mounting tool 2 is removed along the groove of the extrusion nail 1.

In the present embodiment, the grip portion 21 may have an elongated shape. Thereby, it is possible to facilitate handling and use. In some examples, the grip 21 may also be spherical, conical, or irregular in shape. This can be applied to a case where different gripping methods are required.

In the present disclosure, the outer circumference of the leg 22 may be provided with a thread that mates with the thread of the protrusion 11. In this case, when the fitting tool 2 is combined with the extrusion nail 1, the thread of the outer periphery of the leg 22 may be formed complementarily to the thread of the protrusion 11, whereby the efficiency of the extrusion nail 1 into the bone tunnel can be improved.

In some examples, the legs 22 may be tapered. In this case, the portion of the leg 22 near the grip portion 21 is more stable and is less likely to break when being biased.

In some examples, the feet 22 may also be of uniform size. Therefore, the difficulty of the manufacturing process is reduced.

In some examples, the legs 22 may lie on the circumference of the same circle as viewed along the length of the legs 22. This allows the structure of the extrusion nail 1 to be fitted.

In some examples, the individual legs 22 may be arranged in an equiangular manner. That is, the individual legs 22 may be evenly distributed over the circumference. This makes it possible to uniformly apply the force to the extrusion nail 1 and prevent the occurrence of the phenomenon of the slipping thread and the breakage of the leg 22.

In some examples, there may be three legs 22 arranged in an equiangular manner. Thereby, a good stability can be obtained with a minimum number of legs 22 used. In other examples, the legs 22 may be non-equiangularly arranged, in which case the position of the legs 22 may be adapted to the position of the protrusions 11 of a particular staple 1 by providing the legs 22 at non-equiangular positions.

In some examples, the grip 21 is integrally formed with the leg 22. This can prevent the occurrence of falling off, breakage, or the like.

In some examples, the grip 21 may also be provided with a handle. Specifically, the handle may be provided in a direction orthogonal to the grip portion 21. Therefore, a better use effect can be obtained during twisting. In addition, in some examples, the handle may penetrate the grip portion 21 in a penetrating manner along the orthogonal direction of the grip portion 21. In other examples, the handle may be connected to the grip portion 21 in a non-penetrating manner. This also makes it possible to provide a portion that is easy to grip when twisting the compression spike 1, so that a better gripping effect is achieved.

In the present embodiment, the length of the leg 22 may be equal to the length of the protrusion 11 of the extrusion nail 1. In this case, the entire extrusion nail 1 can be simultaneously urged, and the possibility of occurrence of breakage of the legs 22 is reduced while enhancing the efficiency of the urging force.

In other examples, the length of the legs 22 may also be less than the length of the protrusions 11 of the extruded nail 1. In this case, different lengths of the projection 11 can be fitted.

In the present embodiment, the length of the positioning column may be the same as the length of the through hole 12 of the pressing nail 1. In this case, the positioning post is inserted into the through hole 12 to exert a stable force, thereby preventing the wire from slipping.

In some examples, the length of the positioning post may also be smaller than the length of the through hole 12 of the extrusion nail 1. This allows the through-hole 12 to be adapted to different lengths.

In this embodiment, the positioning pillar may be a cylinder. Additionally, in some examples, the positioning posts may also be triangular prisms, cuboids, or polyhedrons. This makes it possible to adapt to different shapes of the through-hole 12 of the staple 1.

While the invention has been specifically described above in connection with the drawings and examples, it will be understood that the above description is not intended to limit the invention in any way. Those skilled in the art can make modifications and variations to the present invention as needed without departing from the true spirit and scope of the invention, and such modifications and variations are within the scope of the invention.

Claims (10)

1. An extrusion nail with a self-locking function is characterized in that,

the method comprises the following steps:

a nail body having an elongated shape, the nail body having a main body and at least two protrusions protruding from the main body in a radial direction, the protrusions extending along a length direction of the nail body,

wherein, in a cross section of the nail body taken along the radial direction, one end side of the protrusion is formed on the nail body in such a manner that the other end side extends to the opposite side with respect to the rotational direction of the nail body, and a thread is formed at a portion of the protrusion facing the outside.

2. The extruded nail of claim 1,

the nail head is connected with the nail body and is gradually contracted.

3. The extruded nail of claim 1,

the nail body is made of one of medical stainless steel, platinum, titanium alloy, titanium-nickel memory alloy, cobalt-chromium alloy or magnesium alloy.

4. The extruded nail of claim 1,

the nail body is made of one of polylactic acid materials, polycaprolactone, polydioxanone, polyether ether ketone or polyglycolic acid, or one of more than two-component random copolymers or block copolymers of lactide, caprolactone, polydioxanone or glycolide.

5. The extruded nail of claim 1,

the shank has a distal end and a proximal end,

the thread has a smaller pitch at the proximal end than at the distal end.

6. The extruded nail of claim 1,

the protrusions are uniformly distributed on the periphery of the nail body.

7. The extruded nail of claim 1,

the extrusion nail is also provided with a through hole penetrating through the nail body along the length direction.

8. The extruded nail of claim 1,

on a cross section of the nail body taken along the radial direction, an included angle between the protrusion and the main body is an acute angle.

9. The extrusion nail according to claim 1 or 6,

a cross section of the shank taken along the radial direction has rotational symmetry.

10. An assembling tool for an extrusion nail is characterized in that,

for operating the extruded nail according to any one of claims 1 to 9.

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